1. ANIMALa)[countable] the hard pointed thing that grows, usually in pairs, on the heads of animals such as cows and goats ⇒ antlersb)[uncountable] the substance that animals’ horns are made of: a knife with a horn handlec)[countable] a part of an animal’s head that sticks out like a horn, for example on a snail

2. ON A CAR [countable] the thing in a vehicle that you use to make a loud sound as a signal or warningsound/toot/honk/blow your horn (=make a noise with your horn)

3. MUSICAL INSTRUMENT [countable]a) a musical instrument like a long metal tube that is wide at one end, that you play by blowingb)informal a trumpetc) a French hornd) a musical instrument made from an animal’s horn ⇒ English horn

4. drinking horn/powder horn etc a container in the shape of an animal’s horn, used in the past for drinking from, carrying gunpowder etc

5. draw/pull in your horns to reduce the amount of money you spend

6. be on the horns of a dilemma to be in a situation in which you have to choose between two equally unpleasant or difficult situations ⇒ blow your own trumpet/horn at blow1(21), ⇒ lock horns at lock1(6), ⇒ take the bull by the horns at bull1(3)